Advanced Diagnostics

Advanced Diagnostics - DTC P1586 (23): Battery Current Sensor Signal Malfunction






General Description
The battery module current is monitored to manage the battery module in the IMA (integrated motor assist) system. When normal current value cannot be detected, it may have an adverse effect on emissions and performance. When the high voltage contractor is turned on, motor power inverter (MPI) module current and battery module current is monitored on the same line across the DC-DC converter and the A/C compressor driver that supplies power to the accessory. Therefore, when the MPI module current and the battery module current values are compared and a difference of more than a specified value has occurred for a specified time, or when the battery module current is at a specified value and this condition continues for a specified time when the driving torque of a specified value or more occurred, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
One of these conditions occurs:
- The difference between the MPI current and the battery module current is more than 40 A for at least 0.5 second.
- The battery module current is 3 A or less for at least 0.3 second, when the IMA motor driving torque is 10 N.m (1.0 kgf.m, 7.4 lbf.ft) or more.

Driving Pattern
1. Connect the HDS, and start the engine.
2. Let the engine idle for at least 5 seconds.
3. Accelerate the vehicle with wide open throttle for at least 5 seconds.
4. Apply the brakes, and decelerate the vehicle for at least 5 seconds. Then stop the vehicle, and let it go into idle stop.
5. Repeat steps 2 through 4.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM and the BCM module memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.